The major difference between B2B (Business to Business) and B2C (Business to Customer) in internet terms is the role of the B2B website. B2B concerns itself primarily with supply chain management. These are portals that allow businesses to deal directly with their suppliers and distributors online.  Allowing electronic transfer of orders, invoicing and even payments. Wholesalers, distributors and manufacturers fall in this category. 

B2C websites are intermediary portals to link customers to suppliers. B2C concerns itself with selling to the end user. These sites are more interested in passing the goods to the end user. There is likely a slight difference between them and your business. They are actually internet based. That is to say they exist primarily on the internet. Offices and warehousing are borne from necessity of their internet success.